src/smolagents/agents.py [1211:1231]:
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                "custom_instructions": self.instructions,
            },
        )
        return system_prompt

    def _step_stream(
        self, memory_step: ActionStep
    ) -> Generator[ChatMessageStreamDelta | ToolCall | ToolOutput | ActionOutput]:
        """
        Perform one step in the ReAct framework: the agent thinks, acts, and observes the result.
        Yields ChatMessageStreamDelta during the run if streaming is enabled.
        At the end, yields either None if the step is not final, or the final answer.
        """
        memory_messages = self.write_memory_to_messages()

        input_messages = memory_messages.copy()

        # Add new step in logs
        memory_step.model_input_messages = input_messages

        try:
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src/smolagents/agents.py [1561:1579]:
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                "custom_instructions": self.instructions,
            },
        )
        return system_prompt

    def _step_stream(
        self, memory_step: ActionStep
    ) -> Generator[ChatMessageStreamDelta | ToolCall | ToolOutput | ActionOutput]:
        """
        Perform one step in the ReAct framework: the agent thinks, acts, and observes the result.
        Yields ChatMessageStreamDelta during the run if streaming is enabled.
        At the end, yields either None if the step is not final, or the final answer.
        """
        memory_messages = self.write_memory_to_messages()

        input_messages = memory_messages.copy()
        ### Generate model output ###
        memory_step.model_input_messages = input_messages
        try:
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